Improvement in engine-governors



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JOHN D. LYNDE, OF PHILADELPHIA, PENNSYLVANIA;

Letters Patent No, 112,058, dated February 21, 187,1.

IMPROVEMENT IN ENGINEGOVERNORS.

The Schedule referred to in these Letters Patent and making part of thev same.

To all whom, it 'may concern p Be it known that I, JOHN D. LYNDE, of Philadelphia,Pennsylvania, have invented Va newand useful Improvement in Governors for Steam-Engines.; and I do hereby declare that the following is afull and exact'description ofthe construction and operation of thesame, reference being `had to theannexed drawing forming part hereof.

'ihe object of this invention is .to produce a governor for steamecugines which, in its moyements, shall bc'niore sensitive, `more immediate in its action, and thcrebymore evenly regulate the motion of the engine, irrespective of its load. v

The governing-valve is equally balanced under any and varying pressures of steam, and at any'pbint of opening from the minimum to the maximum extent. The centrifugal weights are so arranged in connec' tion with the springs that the Aleast change in thc cngines speed will immediately be compensated for by a diminution or increase of the steam allowed to cuter into they, steam-cylinder, and thereby measure ont the power in the exact ratio to the demand andl uniform speed of the engine under various degrees of steam-pressure and resistance.

The construction of the brake and its arrangement, whereby to instantly and yeffectually arrest the ingress of steam to the steam-cylinder when the governorbclt runs off its pulley or breaks, is an essential object /oi this invention in preventing a break-down or other accident.

To obtain'thc best results from a governor it is imperiously necessary that the centrifugal weights be acted ou by no power other than the motion of the engine, while-they should be so suspended and in such a position as to expand m'ost readily and with greatest power vat a sudden start of the engine, and which position should also be that from which they will be the quickest depressed' at any diminution of the speed of the engine. Many governors work well one way,

'while thc'other they are too slow.

Figure l of the drawing represents the spring-case, with apart cut'out to exhibit a portion ofthe spring C.

Figure 2 is a sectional view of the case, containing. springs (l and c, with the rod D.

Figure this an exhibit of another method of construction and arrangement of thc weights A and S,

possible from the center (if/'motion without loss of leverage, they are suspended Abyarms B,Awhich are curved at any desired point lbetween the fulcrums H -in the various joints ot' connection, so that immediate action isobtained in making tile-changes required.

p By tightening or loosening the springs O and c, by means of the nut W, the speed of the engine may be increased or diminished. y

Now, in order `to guard against any possible weakening of thesprings C c the upper one is made much weaker than the other,aud may be closed before the' other one will be pcrceptibly compressed, which will occur about the time the weights A have expanded one-half their range ofoutward movement. The

upper spring is coiled quite finely, occupying about one-haii' the usual space of spiral springs made of the same size of wire, and always being closed when in use, 'its elasticity will be permanent. Whilethe lower spring is compressed so little the change in its strength will be of little, if' any, importance, whereas, if it performedthe duty offboth, or that due to the necessary action of a single spring moving the whole distance, it would be less efficient in large governors. In small governors the distance the'spriug will be compressed is so little that one may be sucient.

The weights S, shown in a horizontal position, -areV suspended on the arms B of the weights A by branch arms, so that, when theweights A extend outward by centrifugal force, the weights S are raised above the periphery of motion, and serve not only to steady the working of the governor, but, being carried above the central line ot' motion, when the speed of the engine slackens, the partial diminution of the very centrifw.

, gal force which raised the weights S renders available the weights Ain instantly allowing them to depress, and thereby a'c'tuate, thegovernor-valve, so as to measurel ont' the steam to the engine in such quantity aswill cause a uniform motion, irrespective of sudden changes of resistance to the engines power.

rlhe devices connecting the arms B ,with the valverod D are of the most simpleconstrnction, and the 4bearingslei'ng allstecl, the friction is reduced to the lowest possible amount.v

A A crosseheadis secured to the valveestem D by the hollow-pointed set-screw O.

lo -pmvide forwear the top of the column P 1s pro- 4vided with a movable collar, F, which may be moved .up as thebearing of the head Gr wears away and then held in place by a-,set-screw.

- The `'valve-rod, coupling, and lever are. similar to 

